/*two_func.c -- 一个文件中包含俩个函数*/
#include "stdio.h"

//声明函数
void butler(void); /*ANSI/ISO C函数原型*/

int main(void){

    printf("I will summon the butler function. \n");
    butler();
    printf("Yes, Bring me some tea and writeable DVDs. \n");

    return 0;
}

void butler(void){/*函数定义开始*/
    printf("You rang, sir? \n");
}